If you're trying to report stolen jewellery but the police require proof of ownership like bills, there are alternative avenues. Your mother, as the rightful owner, could file a complaint detailing the circumstances of the theft, even if she has passed away, provided you have details of the items. You can also escalate the complaint to the Superintendent of Police via registered post if the local station is uncooperative. Given the potential inheritance dispute, a civil suit for partition to claim your share of the property might be necessary.